GE/Jasco Dimmers not able to dim?

[JDRoberts]

The Insteon switches are not compatible with SmartThings, though. So you’re taking yourself into a whole separate network just for lighting, which some people do.

The only one I know of which Does not require a neutral and is reliable with smartthings is the smartIT toggle switch:

Battery Operated 3 Toggle Switch for wallmount or table top use (SmartenIT ZBWS3B) [DEPRECATED: STOPPED WORKING IN 2018]

This code stopped working with the 2018 version of the SmartThings app. The device should no longer be considered compatible. Yes, Virginia, there is a battery operated toggle switch that looks like a regular switch and can be used to change modes, run Hello Home Actions, or toggle one or more devices on and off! It does have 3 toggle “buttons” instead of just 1, which some people will see as a negative, but it’s a very nice device. It can be mounted on the wall anywhere, it does not require any wiring. Or it can just lie flat on a table. It’s zigbee, but because SmartThings supports both zigbee and zwave, that doesn’t matter, you can still use it to control any of the devices you control through SmartThings. You can also easily feel the separations between the three toggles, …

Battery operated, though.